package api;

/**
 * @Author admin
 * @Date 2019/3/27 9:09
 */
public class T4 {
    public static void main(String[] args) {
    String st=new String("dadada");
    st=st+"sadad";
        System.out.println(st.getClass()+"@"+st.hashCode()+";"+st);
     StringBuffer st1=new StringBuffer("DAA");
     st1=st1.append('w');
        System.out.println(st1);


    }
}
